PHP之克隆clone

淺克隆：只是克隆對像中的非對象非資源數據，即對像中屬性存儲的是對象類型，則會出現克隆不完全

<code><span><span><?php </span><span><span>class</span><span>B</span>{</span><span>public</span><span>$val</span> = <span>10</span>;
}

<span><span>class</span><span>A</span>{</span><span>public</span><span>$val</span> = <span>20</span>;
    <span>public</span><span>$b</span>;
    <span>public</span><span><span>function</span><span>__construct</span><span>()</span>{</span><span>$this</span>->b = <span>new</span> B();
    }
}

<span>$obj_a</span> = <span>new</span> A();
<span>$obj_b</span> = <span>clone</span><span>$obj_a</span>;
<span>$obj_a</span>->val = <span>30</span>;
<span>$obj_a</span>->b->val = <span>40</span>;

var_dump(<span>$obj_a</span>);
<span>echo</span><span>'<br>'</span>;
var_dump(<span>$obj_b</span>);</span></span></code>

深克隆：一個對象的所有屬性數據都徹底的複製，需要使用魔術方法__clone()，並在裡面實現深度克隆

<code><span><span><?php </span><span><span>class</span><span>B</span>{</span><span>public</span><span>$val</span> = <span>10</span>;
}

<span><span>class</span><span>A</span>{</span><span>public</span><span>$val</span> = <span>20</span>;
    <span>public</span><span>$b</span>;
    <span>public</span><span><span>function</span><span>__construct</span><span>()</span>{</span><span>$this</span>->b = <span>new</span> B();
    }
    <span>public</span><span><span>function</span><span>__clone</span><span>()</span>{</span><span>$this</span>->b = <span>clone</span><span>$this</span>->b;
    }
}

<span>$obj_a</span> = <span>new</span> A();
<span>$obj_b</span> = <span>clone</span><span>$obj_a</span>;
<span>$obj_a</span>->val = <span>30</span>;
<span>$obj_a</span>->b->val = <span>40</span>;

var_dump(<span>$obj_a</span>);
<span>echo</span><span>'<br>'</span>;
var_dump(<span>$obj_b</span>);</span></span></code>

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以上就介紹了PHP之克隆clone，包含了方面的內容，希望對PHP教學有興趣的朋友有幫助。